CPE 135A

I. Product Overview

Chlorinated Polyethylene (CPE) is a novel synthetic polymer produced through the chlorination of High-Density Polyethylene (HDPE). The chlorination process disrupts the crystalline structure of HDPE, transforming it into a saturated, polar rubber-like elastomer. CPE uniquely combines the characteristics of both plastics and rubbers. Renowned for its exceptional weatherability, flame retardancy, oil resistance, and impact modification capabilities, it plays an indispensable role, particularly in the fields of rigid PVC products and flame-retardant materials.

II. Key Characteristics & Advantages

1. Excellent Flame Retardancy and Low Smoke Emission

   · Core Advantage: The inherent chlorine content in CPE provides intrinsic flame retardancy. When used synergistically with inorganic flame retardants, it significantly enhances a material's flame resistance rating (achieving UL94 V-0) and effectively reduces smoke emission during combustion.

   · Application Example: A key flame retardant for manufacturing flame-retardant wire/cable conduits, conveyor belts, and materials for underground mining applications.

2. Outstanding Weatherability and Chemical Resistance

   · Core Advantage: Its saturated molecular structure, devoid of double bonds, grants excellent resistance to ozone, UV radiation, and aging. It also demonstrates good resistance to acids, alkalis, oils, and other chemicals.

   · Application Example: Used in outdoor building materials and plastic window/door profiles, ensuring long-term performance without aging or deformation in harsh environments.

3. Highly Effective Impact Modification

   · Core Advantage: As a highly efficient impact modifier for PVC, it substantially increases the notch impact strength of rigid PVC, often outperforming many traditional elastomers.

   · Application Example: Widely used in rigid PVC products requiring high toughness, such as pipes, fittings, and window frames.

4. Good Compatibility and Processability

   · Core Advantage: Exhibits good compatibility with various polymers like PVC and polyethylene. It is easy to compound and disperse, offering a wide processing window.

   · Application Example: In PVC processing, it not only enhances toughness but also improves material plastification and melt flow.

III. Primary Application Fields

1. PVC Plastic Modification

   · Impact Modification: Rigid PVC profiles (windows/doors), pipes/fittings, sheets.

   · Flame Retardancy & Plasticization: Used in soft PVC flame-retardant conveyor belts, floor coverings, wire and cable, etc.

2. Wire & Cable Industry

   · Cable Sheathing: Used for cable jacketing compounds requiring high flame retardancy, oil resistance, and weatherability (e.g., mining, shipboard), often competing with or used alongside CR (Chloroprene Rubber).

3. Rubber Products

   · Specialty Rubber: Used to manufacture oil-resistant, acid/alkali-resistant hoses, belts, and seals, partially replacing CR and CSM (Chlorosulfonated Polyethylene) with high cost-effectiveness.

4. Magnetic Materials

   · Binder: Serves as a binder for flexible magnets, providing flexibility and processability.

5. Coatings and Adhesives

   · Heavy-Duty Anticorrosive Coatings: Utilizes its excellent weatherability and chemical stability for protective coatings on chemical equipment and structural steel in construction.

IV. CPE's Advantages vs. Other Modifiers

· vs. ACR (Acrylate Impact Modifier): CPE provides high impact resistance while also offering superior flame retardancy and weatherability, often at a more competitive cost.

· vs. MBS (Methyl Methacrylate-Butadiene-Styrene Copolymer): While MBS offers good transparency, it has poor weatherability. CPE's excellent weatherability makes it the preferred choice for outdoor PVC products.

· vs. EPDM (Ethylene Propylene Diene Monomer): CPE exhibits better compatibility with PVC and possesses intrinsic flame retardancy, eliminating the need for complex co-curing processes required with EPDM.